Nature –
Virologist Dave O’Connor admits that he was getting desperate when he started asking dog owners for poo samples. For much of 2022, O’Connor, at the University of Wisconsin–Madison, and his colleagues have been tracking a heavily mutated variant of SARS-CoV-2, the virus that causes COVID-19. Early this year, they discovered the variant in Wisconsin waste water drawn from more than 100,000 people.
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